<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .container {
            font-size: 20px;
            height: 150px;
            /*line-height: 50px;*/
            /*line-height: 2;*/
            line-height: 200%;
        }
        p {
            background-color: #ccc;
            font-size: 16px;
        }
    </style>
</head>
<body>
<div class="container">
    <p>
        这是一行文字
    </p>
</div>
</body>
</html>
